I watched something on the history channel last night where a power plant in Arizona or New Mexico was working on a project to reclaim the CO2 and H2O gaseous emissions that would otherwise be emitted as greenhouse gases. They would then feed the CO2 and H2O mixture through some algae growing tanks, where photosynthesis converted the CO2 back to oxygen. The algae could be periodically harvested, which could be distilled to make ethanol, then what was left after distillation could be used for cattle feed. My point is, ethanol does not have to be made from corn. That's what everyone is pushing right now, but with further research, other methods should become easier and cheaper. There are also ways that use the byproducts of food corn, such as the husks and the cob, to make ethanol.